/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlinePurchaseInterface.h
Delegate called when checkout process completes
typedef TBaseDelegate_TwoParams< void, const [FOnlineError](API\Plugins\OnlineSubsystem\FOnlineError) &, const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FPurchaseReceipt](API\Plugins\OnlineSubsystem\Interfaces\FPurchaseReceipt) > & > FOnPurchaseCheckoutComplete